C++性能測試用例

最近看了<<重構:改善現有代碼...>>里面的JAVA人寫了一個測試用例,吹噓用到了JAVA反射等"高級功能",我也寫一些測試代碼看看.
首先是代表性能數據的類:

class CapabilityCount 
{
public:
 static void Out();
 char* m_clue;
 CapabilityCount *m_pre;
 DWORD m_frequency;
 DWORD m_times;
static CapabilityCount*head;
 CapabilityCount(char* clue);
 
};
CapabilityCount*CapabilityCount::head=0;

CapabilityCount::CapabilityCount(char*clue)
{
 m_pre=head;
 head=this;
    m_clue=clue;//連成一片,接受一個字符串作輸出標識.
}

void CapabilityCount::Out()//輸出到文本文件
{
 std::fstream  out;
 CTime time;
 out.open ("d:\\testcount.txt",std::ios_base::ate|std::ios_base::out);
 ASSERT(out.is_open ());
 time=CTime::GetCurrentTime();
 out<<"is begin write in"<<time.GetDay() <<" : "
  <<time.GetHour ()<<" : "
  <<time.GetMinute ()<<"\n";
 CapabilityCount *psearch=head;

 while(psearch)
 {
 out<<"type:"<<psearch->m_clue<<"all time(milliseconds):"<<psearch->m_times
  <<"      be call frequency :"<<psearch->m_frequency
  <<"      average time(milliseconds):"
  <<psearch->m_times /psearch->m_frequency<<"\n\n";
 psearch=psearch->m_pre ;
 }

}

然后是一個"改動者",負責更新CapabilityCount類

class CapabilityCountHelper 
{
 DWORD m_begintime;
 CapabilityCount &m_supervised;
public:
 CapabilityCountHelper(CapabilityCount& in);
 ~CapabilityCountHelper();

};

CapabilityCountHelper::CapabilityCountHelper(CapabilityCount& in):
m_supervised(in)
{
 m_begintime=GetTickCount();
 ++m_supervised.m_frequency;//被調用的次數
}

CapabilityCountHelper::~CapabilityCountHelper()
{
 DWORD spend=GetTickCount()-m_begintime;
 m_supervised.m_times +=spend;//花掉的總時間
}

知道怎么用吧?
在要測試的函數前加上
 static CapabilityCount   //一定要有static哦
     CapabilityCountInstance("function name or else"); 
     CapabilityCountHelper CapabilityCountHelperInstance(CapabilityCountInstance);

嫌麻煩?
#define KILL_BILL__KILL_BILL__KILL_BILL(clue)   static CapabilityCount   \
     CapabilityCountInstance(clue);   \
      CapabilityCountHelper CapabilityCountHelperInstance(CapabilityCountInstance) \

最近想看<<殺死比爾>>,雖然殺的不是我想的:(

你可以用更精確的時間函數來測試.不過這不關我事;

你也可以在內聯函數中或甚至上面的CapabilityCount::Out函數中加入
KILL_BILL__KILL_BILL__KILL_BILL("CapabilityCount::Out");
發生什么事可不關我事:(

原文轉自：http://www.kjueaiud.com